Re: psql: no schema info

chester c young wrote:

> # create table new_schema.table1(
> # col1 integer default nextval( 'seq1' )
> # );
>
> using old_schema.seq1, not new_schema.seq1

Yes, that's correct -- assuming you had an old_schema.seq1 sequence too.

> and imho to make matters more difficult to troubleshoot:
>
> # \dt table1 -> does not show which schema for seq1

I agree it can be confusing if you're not looking for it.

alvherre=# set search_path to old_s;
SET
alvherre=# \d new_s.table1
Tabla «new_s.table1»
Columna | Tipo | Modificadores
---------+---------+-----------------------------------
col1 | integer | default nextval('seq1'::regclass)

Here, the nextval() is correctly _not_ qualified, because the current
search path is the sequence's schema. But it is certainly confusing.

You have to set the search_path to the table's search path for the
problem to be obvious:

alvherre=# set search_path to new_s;
SET
alvherre=# \d new_s.table1
Tabla «new_s.table1»
Columna | Tipo | Modificadores
---------+---------+-----------------------------------------
col1 | integer | default nextval('old_s.seq1'::regclass)

alvherre=# \d table1
Tabla «new_s.table1»
Columna | Tipo | Modificadores
---------+---------+-----------------------------------------
col1 | integer | default nextval('old_s.seq1'::regclass)

I'm not sure what's a good solution here. Perhaps the \d command should
temporarily set the schema to something that would cause regclass to
display qualified names all the time, when you passed it a qualified
name (using SET LOCAL perhaps, but reverting to the original value after
then \d is done). You can't just use a nonexistant schema or some kind
of NULL or empty value, because SET rejects it. I can set it to $user,
which is accepted but doesn't exist on my scratch database:

alvherre=# set search_path to '$user';
SET
alvherre=# \d new_s.table1
Tabla «new_s.table1»
Columna | Tipo | Modificadores
---------+---------+-----------------------------------------
col1 | integer | default nextval('old_s.seq1'::regclass)

Another option would be to set it to the given schema, so that any name
not on that schema is qualified.

--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support